JP2003012003A - Lid of cold insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength and rigidity of a lid of a cold insulating container and prevent the lid from warping due to difference in thermal expansion by a difference in temperatures between the inside and the outside of the container by welding a plurality of reinforcing and welding ribs formed on a base plate of a lower lid with a top plate of an upper lid. SOLUTION: The lid C of a cold insulating container comprises a plurality of reinforcing and welding ribs 5 formed on a base plate 1 of a lower lid C1 and a top plate 7 of an upper lid C2 which are welded.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a cool container used for a cool container. 2. Description of the Related Art Conventionally, an upper lid and a lower lid are integrally formed by blow molding or the like.
Joined by hot air welding or high-frequency welding to form a hollow lid with a hollow inside, then inject foamable resin liquid such as foamable urethane resin into the hollow lid from the injection hole and heat and foam. Known is a lid for a cold storage container whose inside is filled with a foamed resin (for example, Japanese Utility Model Application Laid-Open No.
And Japanese Utility Model Publication No. 60-1084). [0003] The above-described conventional cold storage container lid has a problem that the lid is warped due to a difference in thermal expansion due to a temperature difference between the inside and outside of the cold storage container. On the lower lid, corrugated irregularities and crossed irregularities are formed, and the thickness of the upper lid and the lower lid is increased. However, when the lower lid has corrugated irregularities or crossed irregularities, the lid is poorly cleansable, and in the case of a cold storage container for storing foodstuffs and the like, the poor cleanability of the lid is a hygienic problem. , A big problem. Further, when the thickness of the upper lid or the lower lid is increased, there is a problem that the lid becomes heavier. [0004] An object of the present invention is to solve the problems of the above-mentioned conventional lid for a cold storage container. According to the present invention, in order to achieve the above-mentioned object, a plurality of reinforcing and welding ribs formed on a bottom plate of a lower lid and a top plate of an upper lid are welded. Things. An embodiment of the present invention will be described below, but the present invention is not limited to the embodiment unless it departs from the gist of the present invention. The lid for a cool container of the present invention comprises a lower lid C1, an upper lid C2, and a heat insulating material M provided between the lower lid C1 and the upper lid C2. First, the lower lid C1 will be described with reference to FIGS. 1 to 3 and FIG. A lower cover C having a substantially rectangular planar shape.
1 has a bottom plate 1, a peripheral wall 2 extending upward from the periphery of the bottom plate 1 so as to surround the bottom plate 1, and a horizontal flange 3 extending substantially horizontally outward from an upper end of the peripheral wall 2. An annular projection 3 a extending upward is formed on the periphery of the horizontal flange 3. In addition, a frame-shaped annular groove 4 is formed in the bottom plate 1 along the peripheral wall 2. Reference numeral 5 denotes a reinforcing / welding rib formed on the bottom plate 1 located in the annular groove 4 and extending upward beyond the horizontal flange 3. The rib 5 has a cross section perpendicular to the longitudinal direction. The shape is elongated and substantially trapezoidal. The rib 5 is parallel to one opposite side of the bottom plate 1 and at a predetermined interval,
A plurality of them are protruded. In this embodiment, an example is shown in which eight ribs 5 protrude in parallel with the long sides 1a of the bottom plate 1 facing each other. Reference numeral 6 denotes an air vent cylinder having a substantially truncated conical vertical cross section formed by expanding an appropriate portion of the bottom plate 1 upward, and is slightly lower than the rib 5. Next, the upper cover C2 will be described with reference to FIGS. 1, 4, 5 and 7. An upper cover C2 having a substantially rectangular planar shape substantially the same size as the above-mentioned lower cover C1 is provided with a top plate 7 and an annular protrusion protruding in a frame shape along the periphery of the top plate 7. And an outer peripheral wall 8a forming the annular projection 8 extends downward beyond the top plate 7. From the lower end of the outer peripheral wall 8a that forms the annular convex portion 8, a horizontal flange 9 extending substantially horizontally is formed on the outside.
An annular projection 9a extending downward is formed on the lower surface of. As shown in FIGS. 6 and 7, when the lower lid C1 is covered with the upper lid C2, the annular projection 9a formed on the horizontal flange 9 of the upper lid C2 is fixed to the horizontal flange 9 of the lower lid C1. 3 and a horizontal gap 9 is formed between the annular projection 3a formed on the horizontal flange 3 of the lower lid C1 and the horizontal flange 9 of the upper lid C2. The annular projection 3a formed on the horizontal flange 3 of the lid C1 is configured to be located outside the annular projection 9a formed on the horizontal flange 9 of the upper lid C2. Thus, when the lower lid C1 is put on the upper lid C2,
The rib 5 for reinforcement and welding formed on the bottom plate 1 is configured to contact or substantially contact the lower surface of the top plate 7 of the upper lid C2. When the upper lid C2 is put on the lower lid C1, the lower lid located between the annular projection 9a formed on the horizontal flange 9 of the upper lid C2 and the annular projection 3a formed on the horizontal flange 3 of the lower lid C1. It is preferable to form an annular groove 3b on the upper surface of the horizontal flange 3 of C1. As described above, before covering the lower lid C1 with the upper lid C2, the block-shaped or plate-shaped heat insulating material M made of foamed resin is spread over the lower lid C1. The heat insulating material M arranged on the lower lid C1 is laid so that the upper surface does not protrude upward beyond the upper end of the rib 5 for reinforcement and welding. It is preferable that the ribs are arranged so as to be located slightly below the upper end of the rib 5 for use. As described above, the lower cover C1 covered with the heat insulating material M is fixed to the vibration welding machine base,
Attach the upper lid C2 to the vibration device of the vibration welding machine, and then
When the vibration device is vibrated in the horizontal direction, an annular projection 9a formed on the horizontal flange 3 of the lower lid C1 and the horizontal flange 9 of the upper lid C2 placed on the horizontal flange 3 of the lower lid C1.
And the contact surface between the horizontal flange 3 of the lower lid C1 and the annular projection 9a formed on the horizontal flange 9 of the upper lid C2 and the vicinity thereof melt, and the horizontal flange 3 of the lower lid C1 At the same time as the annular projection 9a formed on the horizontal flange 9 of the upper cover C2 is welded, the top plate 7 of the upper cover C2 and the lower cover C1 that is in contact with or substantially in contact with the top plate 7 of the upper cover C2. Frictional heat is generated between the reinforcing and welding ribs 5 formed on the bottom plate 1 of the upper cover C2, and the contact surface between the top plate 7 of the upper lid C2 and the rib 5 formed on the bottom plate 1 of the lower lid C1 and its vicinity. Is melted, and the top plate 7 of the upper lid C2 and the rib 5 formed on the bottom plate 1 of the lower lid C1 are welded. The molten resin liquid generated during the welding operation between the horizontal flange 3 of the lower lid C1 and the annular projection 9a formed on the horizontal flange 9 of the upper lid C2 is filled with the above-mentioned annular projection 9a formed on the horizontal flange 9 of the upper lid C2. And the horizontal flange 3 of the lower lid C1 located between the annular projection 3a formed on the horizontal flange 3 of the lower lid C1.
Is stored in the annular groove 3b formed in the lower cover C
Due to the annular projection 3a formed on one horizontal flange 3,
It is possible to prevent the molten resin liquid from flowing out beyond the annular projection 3a. Next, a needle of a vacuum device (not shown) is inserted into the through hole 6a of the air release cylinder 6 formed in the lower lid C1, and the lower lid C1 and the upper lid C, which are welded as described above, are inserted.
2 is removed. Thereafter, a plug 10 formed of a thermoplastic resin is inserted into the through hole 6a of the air release cylinder 6.
Is inserted, and then the plug 10 is rotated at a high speed, and the frictional heat causes the columnar portion 10a of the plug 10 to be inserted.
And / or the inner peripheral surface of the air release cylinder 6 is melted to weld the plug 10 and the air release cylinder 6, and the cold storage container lid C
Will be manufactured. According to the present invention, as described above, a plurality of reinforcing and welding ribs 5 formed on the bottom plate 1 of the lower lid C1 and the upper lid C
Since the second top plate 7 is welded, the strength and rigidity of the cool container lid C are improved, and the warp deformation of the cover due to the difference in thermal expansion between the inside and outside of the cool container can be prevented. The reinforcing and welding rib 5 is provided with a lid C for a cold storage container.
, So the outer surface of the cool container lid C is
Since there is no corrugated unevenness or crossed unevenness unlike the conventional case, the cleanability of the cool container lid C is improved. Since the present invention has the above-described structure, the following effects can be obtained. Since a plurality of reinforcing and welding ribs formed on the bottom plate of the lower lid and the top plate of the upper lid are welded, the strength and rigidity of the lid for the cold storage container are improved, and the temperature inside and outside the cold storage container is improved. The warpage of the lid due to the difference in thermal expansion due to the difference can be prevented. Since the ribs for reinforcing and welding are present inside the lid for the cold storage container, the outer surface of the lid for the cold storage container does not have the corrugated unevenness or the cross unevenness unlike the conventional case. The cleaning property of the lid is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a lid for a cold storage container of the present invention. FIG. 2 is a perspective view of a lower lid constituting a lid for a cold storage container of the present invention. FIG. 3 is a vertical cross-sectional view along a long side direction of a lower cover constituting the cool storage container cover of the present invention. FIG. 4 is a perspective view of an upper cover constituting the cool storage container cover of the present invention. FIG. 5 is a vertical cross-sectional view along the long side direction of the upper cover constituting the cool storage container cover of the present invention. FIG. 6 is a vertical cross-sectional view along the short side direction before welding, in which the lid for a cold storage container of the present invention is assembled. FIG. 7 is a partially enlarged vertical sectional view showing a state in which the lid for a cold storage container of the present invention is assembled and before welding. FIG. 8 is a partially enlarged vertical cross-sectional view of the vicinity of an air release cylinder of the lid for a cool storage container of the present invention. FIG. 9 is a partially enlarged vertical sectional view of the vicinity of an air vent cylinder of the lid for a cold storage container of the present invention. [Explanation of symbols] C ·····································································・ Top cover M ・ ・ ・ ・ ・ ・ Insulation material5 ・ ・ ・ ・ ・ ・ Rib

Continuation of front page    F term (reference) 3E067 BA02A BB14A BB17A EE39                       GA14 GD10                 3E084 AA05 AA14 BA02 CA03 CC03                       FA09 GA08 GB12 JA20

Claims (1)

Claims: 1. A lid for a cold storage container, wherein a plurality of reinforcing and welding ribs formed on a bottom plate of a lower lid and a top plate of an upper lid are welded.